#!/bin/sh
#
# ocf:pacemaker:Dummy resource agent
#
# Original copyright 2004 SUSE LINUX AG, Lars Marowsky-Br<E9>e
# Later changes copyright 2008-2023 the Pacemaker project contributors
#
# The version control history for this file may have further details.
#
# This source code is licensed under the GNU General Public License version 2
# (GPLv2) WITHOUT ANY WARRANTY.

#
# The Dummy agent is intended primarily for testing, and has various options to
# make actions intentionally fail or take a long time. It may also be used as a
# template for resource agent writers, in which case:
#
# - Replace all occurrences of "dummy" and "Dummy" with your agent name.
# - Update the meta-data appropriately for your agent, such as the description
#   and supported options. Pay particular attention to the timeouts specified in
#   the actions section; they should be meaningful for the kind of service the
#   agent manages. They should be the minimum advised timeouts, but shouldn't
#   try to cover _all_ possible instances. So, try to be neither overly generous
#   nor too stingy, but moderate. The minimum timeouts should never be below 10
#   seconds.
# - Don't copy the stuff here that is just for testing, such as the
#   sigterm_handler() or dump_env().
# - You don't need the state file stuff here if you have a better way of
#   determining whether your service is running. It's only useful for agents
#   such as health agents that don't actually correspond to a running service.
# - Implement the actions appropriately for your service. Your monitor action
#   must differentiate correctly between running, not running, and failed (that
#   is THREE states, not just yes/no). The migrate_to, migrate_from, and reload
#   actions are optional and not appropriate to all services.
#

#######################################################################
# Initialization:

: ${OCF_FUNCTIONS:="${OCF_ROOT}/resource.d/heartbeat/.ocf-shellfuncs"}
. "${OCF_FUNCTIONS}"
: ${__OCF_ACTION:="$1"}

# Explicitly list all environment variables used, to make static analysis happy
: ${OCF_RESKEY_fake:="dummy"}
: ${OCF_RESKEY_op_sleep:=0}
: ${OCF_RESKEY_CRM_meta_interval:=0}
: ${OCF_RESKEY_CRM_meta_globally_unique:="false"}
: ${OCF_RESKEY_envfile:=""}
: ${OCF_RESKEY_fail_start_on:=""}
: ${OCF_RESKEY_migrate_source:=""}
: ${OCF_RESKEY_migrate_target:=""}
: ${OCF_RESKEY_envfile:=""}
: ${OCF_RESKEY_state:=""}

#######################################################################

meta_data() {
    cat <<END
<?xml version="1.0"?>
<resource-agent name="Dummy" version="@VERSION@">
<version>1.1</version>

<longdesc lang="en">
This is a dummy OCF resource agent. It does absolutely nothing except keep track
of whether it is running or not, and can be configured so that actions fail or
take a long time. Its purpose is primarily for testing, and to serve as a
template for resource agent writers.
</longdesc>
<shortdesc lang="en">Example stateless resource agent</shortdesc>

<parameters>
<parameter name="state" unique-group="state">
<longdesc lang="en">
Location to store the resource state in.
</longdesc>
<shortdesc lang="en">State file</shortdesc>
<content type="string" default="${HA_VARRUN%%/}/Dummy-${OCF_RESOURCE_INSTANCE}.state" />
</parameter>

<parameter name="passwd" reloadable="1">
<longdesc lang="en">
Fake password field
</longdesc>
<shortdesc lang="en">Password</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="fake" reloadable="1">
<longdesc lang="en">
Fake attribute that can be changed to cause an agent reload
</longdesc>
<shortdesc lang="en">Fake attribute that can be changed to cause an agent reload</shortdesc>
<content type="string" default="dummy" />
</parameter>

<parameter name="op_sleep" reloadable="1">
<longdesc lang="en">
Number of seconds to sleep during operations.  This can be used to test how
the cluster reacts to operation timeouts.
</longdesc>
<shortdesc lang="en">Operation sleep duration in seconds.</shortdesc>
<content type="string" default="0" />
</parameter>

<parameter name="fail_start_on" reloadable="1">
<longdesc lang="en">
Start, migrate_from, and reload-agent actions will return failure if running on
the host specified here, but the resource will run successfully anyway (future
monitor calls will find it running). This can be used to test on-fail=ignore.
</longdesc>
<shortdesc lang="en">Report bogus start failure on specified host</shortdesc>
<content type="string" default="" />
</parameter>

<parameter name="envfile" reloadable="1">
<longdesc lang="en">
If this is set, the environment will be dumped to this file for every call.
</longdesc>
<shortdesc lang="en">Environment dump file</shortdesc>
<content type="string" default="" />
</parameter>

</parameters>

<actions>
<action name="start"        timeout="20s" />
<action name="stop"         timeout="20s" />
<action name="monitor"      timeout="20s" interval="10s" depth="0"/>
<action name="reload"       timeout="20s" />
<action name="reload-agent" timeout="20s" />
<action name="migrate_to"   timeout="20s" />
<action name="migrate_from" timeout="20s" />
<action name="validate-all" timeout="20s" depth="0" />
<action name="meta-data"    timeout="5s" />
</actions>
</resource-agent>
END
}

#######################################################################

# don't exit on TERM, to test that pacemaker-execd makes sure that we do exit
trap sigterm_handler TERM
sigterm_handler() {
    ocf_log info "They use TERM to bring us down. No such luck."

    # Since we're likely going to get KILLed, clean up any monitor
    # serialization in progress, so the next probe doesn't return an error.
    rm -f "${VERIFY_SERIALIZED_FILE}"
    return
}

dummy_usage() {
    cat <<END
usage: $0 {start|stop|monitor|reload|reload-agent|migrate_to|migrate_from|validate-all|meta-data}

Expects to have a fully populated OCF RA-compliant environment set.
END
}

dump_env() {
    if [ "${OCF_RESKEY_envfile}" != "" ]; then
            echo "### ${__OCF_ACTION} @ $(date) ###
$(env | sort)
###" >> "${OCF_RESKEY_envfile}"
    fi
}

dummy_start() {
    dummy_monitor

    DS_RETVAL=$?
    if [ $DS_RETVAL -eq $OCF_SUCCESS ]; then
        if [ "$(uname -n)" = "${OCF_RESKEY_fail_start_on}" ]; then
            DS_RETVAL=$OCF_ERR_GENERIC
        fi
        return $DS_RETVAL
    fi

    touch "${OCF_RESKEY_state}"
    DS_RETVAL=$?
    if [ "$(uname -n)" = "${OCF_RESKEY_fail_start_on}" ]; then
        DS_RETVAL=$OCF_ERR_GENERIC
    fi
    return $DS_RETVAL
}

dummy_stop() {
    dummy_monitor --force
    if [ $? -eq $OCF_SUCCESS ]; then
        rm "${OCF_RESKEY_state}"
    fi
    rm -f "${VERIFY_SERIALIZED_FILE}"
    return $OCF_SUCCESS
}

dummy_monitor() {
    if [ $OCF_RESKEY_op_sleep -ne 0 ]; then
        if [ "$1" = "" ] && [ -f "${VERIFY_SERIALIZED_FILE}" ]; then
            # two monitor ops have occurred at the same time.
            # This verifies a condition in pacemaker-execd regression tests.
            ocf_log err "$VERIFY_SERIALIZED_FILE exists already"
            ocf_exit_reason "alternate universe collision"
            return $OCF_ERR_GENERIC
        fi

        touch "${VERIFY_SERIALIZED_FILE}"
        sleep ${OCF_RESKEY_op_sleep}
        rm "${VERIFY_SERIALIZED_FILE}"
    fi

    if [ -f "${OCF_RESKEY_state}" ]; then
        # Multiple monitor levels are defined to support various tests
        case "$OCF_CHECK_LEVEL" in
            10)
            # monitor level with delay, useful for testing timeouts
            sleep 30
            ;;

            20)
            # monitor level that fails intermittently
            n=$(expr "$(dd if=/dev/urandom bs=1 count=1 2>/dev/null | od | head -1 | cut -f2 -d' ')" % 5)
            if [ $n -eq 1 ]; then
                ocf_exit_reason "smoke detected near CPU fan"
                return $OCF_ERR_GENERIC
            fi
            ;;

            30)
            # monitor level that always fails
            ocf_exit_reason "hyperdrive quota reached"
            return $OCF_ERR_GENERIC
            ;;

            40)
            # monitor level that returns error code from state file
            rc=$(cat ${OCF_RESKEY_state})
            [ -n "$rc" ] && ocf_exit_reason "CPU ejected. Observed leaving the Kronosnet galaxy at $rc times the speed of light." && return $rc
            ;;

            *)
            ;;
        esac
        return $OCF_SUCCESS
    fi
    return $OCF_NOT_RUNNING
}

dummy_validate() {
    # If specified, is op_sleep an integer?
    case "$OCF_RESKEY_op_sleep" in
        ""|*[0-9]*) ;;
        *) return $OCF_ERR_CONFIGURED ;;
    esac

    # Host-specific checks
    if [ "$OCF_CHECK_LEVEL" = "10" ]; then

        # Is the state directory writable?
        state_dir=$(dirname "$OCF_RESKEY_state")
        [ -d "$state_dir" ] && [ -w "$state_dir" ] && [ -x "$state_dir" ]
        if [ $? -ne 0 ]; then
            return $OCF_ERR_ARGS
        fi

        # If specified, is the environment file directory writable?
        if [ -n "$OCF_RESKEY_envfile" ]; then
            envfile_dir=$(dirname "$OCF_RESKEY_envfile")
            [ -d "$envfile_dir" ] && [ -w "$envfile_dir" ] && [ -x "$envfile_dir" ]
            if [ $? -ne 0 ]; then
                return $OCF_ERR_ARGS
            fi
        fi

    fi
    return $OCF_SUCCESS
}

if [ -z "$OCF_RESKEY_state" ]; then
    OCF_RESKEY_state="${HA_VARRUN%%/}/Dummy-${OCF_RESOURCE_INSTANCE}.state"

    if [ "${OCF_RESKEY_CRM_meta_globally_unique}" = "false" ]; then
        # Strip off the trailing clone marker (note + is not portable in sed)
        OCF_RESKEY_state=$(echo $OCF_RESKEY_state | sed s/:[0-9][0-9]*\.state/.state/)
    fi
fi
VERIFY_SERIALIZED_FILE="${OCF_RESKEY_state}.serialized"

dump_env

case "$__OCF_ACTION" in
meta-data)      meta_data
                exit $OCF_SUCCESS
                ;;
start)          dummy_start;;
stop)           dummy_stop;;
monitor)        dummy_monitor;;
migrate_to)     ocf_log info "Migrating ${OCF_RESOURCE_INSTANCE} to ${OCF_RESKEY_CRM_meta_migrate_target}."
                dummy_stop
                ;;
migrate_from)   ocf_log info "Migrating ${OCF_RESOURCE_INSTANCE} from ${OCF_RESKEY_CRM_meta_migrate_source}."
                dummy_start
                ;;
reload)         ocf_log debug "Reloading $OCF_RESOURCE_INSTANCE (service)"
                exit $OCF_SUCCESS
                ;;
reload-agent)   ocf_log err "Reloading $OCF_RESOURCE_INSTANCE (agent)"
                dummy_start
                ;;
validate-all)   dummy_validate;;
usage|help)     dummy_usage
                exit $OCF_SUCCESS
                ;;
*)              dummy_usage
                exit $OCF_ERR_UNIMPLEMENTED
                ;;
esac
rc=$?
ocf_log debug "${OCF_RESOURCE_INSTANCE} $__OCF_ACTION : $rc"
exit $rc

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